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  <title>Document</title>
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<body>
  <script>
    // for(let i=1;i<11;i++){
    //   console.log(i);
    // }
    // console.log(i);//1-10 报错
    // for(const i=1;i<11;i++){
    //   console.log(i);
    // }
    // console.log(i);//1 报错
    for(var i=1;i<11;i++){
      console.log(i);
    }
    console.log(i); // 1 -11
  </script>
</body>

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